H2 Conversion Research Articles

Modeling and optimization of Fischer-Tropsch petroleum products on silica-cobalt catalyst in Fix bed reactor

Fischer–Tropsch synthesis is a heterogeneous catalytic process to product valuable hydrocarbons. In this research, the effects of parameters on Fischer-Tropsch products were investigated with response surface methodology. The modeling of RSM was applied in order to establish a relationship between variables of response with one or several independent variables. This article discusses the optimal condition model for increasing and decreasing the catalytic products. The results showed maximum amount of C5+ selectivity, CO, and H2 conversion also the minimum amount of methane was achieved in T = 256.98 K, P = 10.56 bar, H2/CO = 2 mol/mol and GHSV = 1.8 (NL/g-h).

Enhanced biohydrogen production from sugarcane molasses by adding Ginkgo biloba leaves

Low H2 yield from biomass impedes the industrial application of biohydrogen production. To improve H2 yield, the effect of Ginkgo biloba leaf (GL) on H2 production was investigated in this study. In batch fermentation with sugarcane molasses (SM), the addition of GL improved H2 yield by 28.03%. SM medium was optimized with response surface methodology (RSM) to determine the best concentrations of GL, SM, and an inexpensive nitrogen source—corn steep liquor (CSL). A maximum yield of 1.58 mol-H2/mol-hexose from SM was obtained when GL, CSL and SM hexose were 2.31 g/L, 2.28 g/L and 10 g/L, respectively. As observed with metabolic flux analysis, GL enhanced H2 conversion from SM via altering the metabolic flux distribution of E. harbinense from ethanol pathway towards acetate pathway. This study demonstrated the promotion effect of GL on H2 production from SM, raising a novel method for enhanced biohydrogen production in large scales.

CO Multi-line Imaging of Nearby Galaxies (COMING). IV. Overview of the project

Abstract Observations of the molecular gas in galaxies are vital to understand the evolution and star-forming histories of galaxies. However, galaxies with molecular gas maps of their whole discs at sufficient resolution to distinguish galactic structures are severely lacking. Millimeter-wavelength studies at a high angular resolution across multiple lines and transitions are particularly needed, severely limiting our ability to infer the universal properties of molecular gas in galaxies. Hence, we conducted a legacy project with the 45 m telescope of the Nobeyama Radio Observatory, called the CO Multi-line Imaging of Nearby Galaxies (COMING), which simultaneously observed 147 galaxies with high far-infrared (FIR) flux in 12CO, 13CO, and C18O J = 1–0 lines. The total molecular gas mass was derived using the standard CO–to–H2 conversion factor and found to be positively correlated with the total stellar mass derived from the WISE 3.4 μm band data. The fraction of the total molecular gas mass to the total stellar mass in galaxies does not depend on their Hubble types nor the existence of a galactic bar, although when galaxies in individual morphological types are investigated separately, the fraction seems to decrease with the total stellar mass in early-type galaxies and vice versa in late-type galaxies. No differences in the distribution of the total molecular gas mass, stellar mass, or the total molecular gas to stellar mass ratio was observed between barred and non-barred galaxies, which is likely the result of our sample selection criteria, in that we prioritized observing FIR bright (and thus molecular gas-rich) galaxies.

Competition of electrogens with methanogens for hydrogen in bioanodes

Bioelectrochemical systems (BES) can provide an energy efficient way to recover nutrients from wastewaters. However, the electron donors available in wastewater are often not sufficient to recover the total amount of nutrients. This work investigates hydrogen (H2) as an additional substrate for bioanodes. This hydrogen can be produced in the fermentation of complex organic waste or could be recycled from the cathode. Understanding how to influence the competition of electroactive microorganisms (EAM) with methanogens for H2 gas from different sources is key to successful application of H2 as additional electron donor in bioelectrochemical nutrient recovery. Ethanol (EtOH) was used as model compound for complex wastewaters since it is fermented into both acetate and H2. EtOH was efficiently converted into electricity (e−) by a syntrophic biofilm. Total recovered charge from 1 mM EtOH was 20% higher than for the same amount of acetate. This means that H2 from EtOH fermentation was converted by EAM into electricity. Low EtOH concentrations (1 mM) led to higher conversion efficiencies into electricity than higher concentrations (5 and 10 mM). Thermodynamic calculations show this correlates with a higher energy gain for electrogens compared to methanogens at low H2 concentrations. Cumulatively adding 1 mM EtOH without medium exchange (14 times in 14 days) resulted in stable conversion of H2 to e− (67%–77% e−) rather than methane. With H2 gas as electron donor, 68 ± 2% H2 was converted into e− with no carbon source added, and still 53 ± 5% to e− when 50 mM bicarbonate was provided. These results show that under the provided conditions, electrogens can outcompete methanogens for H2 as additional electron donor in MECs for nutrient recovery.

X‐ray Crystallography and Vibrational Spectroscopy Reveal the Key Determinants of Biocatalytic Dihydrogen Cycling by [NiFe] Hydrogenases

[NiFe] hydrogenases are complex model enzymes for the reversible cleavage of dihydrogen (H2). However, structural determinants of efficient H2 binding to their [NiFe] active site are not properly understood. Here, we present crystallographic and vibrational‐spectroscopic insights into the unexplored structure of the H2‐binding [NiFe] intermediate. Using an F420‐reducing [NiFe]‐hydrogenase from Methanosarcina barkeri as a model enzyme, we show that the protein backbone provides a strained chelating scaffold that tunes the [NiFe] active site for efficient H2 binding and conversion. The protein matrix also directs H2 diffusion to the [NiFe] site via two gas channels and allows the distribution of electrons between functional protomers through a subunit‐bridging FeS cluster. Our findings emphasize the relevance of an atypical Ni coordination, thereby providing a blueprint for the design of bio‐inspired H2‐conversion catalysts.

X‐ray Crystallography and Vibrational Spectroscopy Reveal the Key Determinants of Biocatalytic Dihydrogen Cycling by [NiFe] Hydrogenases

Abstract[NiFe] hydrogenases are complex model enzymes for the reversible cleavage of dihydrogen (H2). However, structural determinants of efficient H2 binding to their [NiFe] active site are not properly understood. Here, we present crystallographic and vibrational‐spectroscopic insights into the unexplored structure of the H2‐binding [NiFe] intermediate. Using an F420‐reducing [NiFe]‐hydrogenase from Methanosarcina barkeri as a model enzyme, we show that the protein backbone provides a strained chelating scaffold that tunes the [NiFe] active site for efficient H2 binding and conversion. The protein matrix also directs H2 diffusion to the [NiFe] site via two gas channels and allows the distribution of electrons between functional protomers through a subunit‐bridging FeS cluster. Our findings emphasize the relevance of an atypical Ni coordination, thereby providing a blueprint for the design of bio‐inspired H2‐conversion catalysts.

Effect of Pressure and Syngas Composition on Direct Synthesis of Dimethyl Ether using Dual Bed Catalyst

National General Energy Plan of Indonesia 2017 (RUEN 2017) stated that dimethyl ether (DME) is appointed as a blending of LPG to reduce LPG imports. DME can be made with two reaction pathways, namely direct synthesis and indirect synthesis. The objective of this study was to determine the effect of pressure and syngas composition on the direct synthesis of DME using dual fixed bed catalyst. The research was carried out with two types of catalyst: M-xxx as a commercial catalyst for methanol synthesis and γ-Al2O3 as catalyst for dehydration of methanol to DME. The later was prepared in our Laboratory of Chemical Reaction Engineering and Catalysis, ITB. The dual catalyst experiment was carried out at 5 and 7 bars, and a fixed temperature of 240oC. The mass ratio of the M-xxx to γ-Al2O3, so-called M/D ratios, were varied from 1/9 to 9/1. Two type of syngas were used, i.e. SA containing only H2 and CO with a SN of 2,3 and SB containing 4% CO2 with SN of 1,8. The dual bed with a M/D ratio of 1/4 gave a CO conversion up to 62% at 5 bars and 240oC (SA). As pressure increased, the conversion of CO and H2 increases to 85% and 83% at 7 bar and 240oC (SA). The presence of CO2 (SB) decreases catalyst activity, as indicated by the decrease in conversion of CO and H2 to 56% and 54%, at 7 bar and 240oC.

Effects of temperature and particle size on the compositions, energy conversions and structural characteristics of pyrolysis products from different crop residues

In order to explore the important influence of pyrolysis conditions on the pyrolysis mechanism and product formation, the compositions, energy conversions and structural characteristics of pyrolysis products from crop residues with various particle sizes at different temperatures were investigated. The results showed that increasing temperature (300–600 °C) resulted in decreases in the yields (75–35%), O (40–6%) and energy conversion rate (88–50%) of biochars, and increases in EC (2.3–6 ms/cm), pH (6.3–10), fixed carbon (16–60%), C (45–70%) and HHV (18–26 MJ/kg) of biochars as well as the percentages of CH4, CnHm, H2, HHV (2.5–13 MJ/kg) and energy conversion rate (1–14%) of gases. Besides, higher temperature also led to increases in specific surface area (1–12 m2/g) and pore volume (0.004–0.028 cm3/g) and decreases in pore diameter (28–8 nm) and functional group intensity of biochars. Among different particle sizes, coarse grinding sample had the highest yield, H, O and carbon conversion rate of biochars, while fine grinding sample had the highest percentages of CO, CH4 and HHV and energy conversion rate of gases. However, ultrafine grinding sample had the lowest biochar and gas yields and the highest pH, C, specific surface area, pore volume and functional group strengths while the smallest pore size.

Crystal refinement of rutile by sonochemical method to achieve high performance Pd catalysts for direct synthesis of hydrogen peroxide

Abstract In this study, sonochemically prepared (S) Pd catalysts supported on anatase (Ana) and rutile (Rut) were compared to incipient wetness impregnated (I) Pd catalysts for the direct synthesis of hydrogen peroxide. Pd/Ana-S and Pd/Rut-S achieved higher H2 conversion than Pd/Ana-I and Pd/Rut-I due to the improvement of metal dispersion by the sonochemical method. Especially, Pd dispersion on Pd/Rut-S was estimated to be six times higher than other catalysts, resulting in the highest H2O2 production rate. Through multiple characterizations (TEM, N2 adsorption-desorption, H2-TPR and CO-chemisorption), we discovered that many parts of the rutile crystals were cracked during the sonochemical treatment, obtaining rectangle shape rutile crystals and two times higher specific surface area. As a result, the sonochemical method played dual-functionalities as follows: physically cracking rutile crystals and inducing small Pd nucleation by cavitation. In addition, electron-deficient Pd species, beneficial for H2O2 selectivity, were dominantly observed on rutile by XPS analysis. This outcome was explained by unstable Ti3+ species on anatase favoring the electron-rich metal. Conclusively, it is demonstrated that the sonochemical method and rutile TiO2 have a substantial synergistic effect on both H2 conversion and H2O2 selectivity for the direct synthesis of hydrogen peroxide.

PENGARUH PERBEDAAN BANTUK BAHAN BAKU DAN SUHU GASIFIKASI AMPAS TEBU TERHADAP PRODUKSI HIDROGEN

The use of fossil fuel at this time is very disturbing the survival, especially related to environmental and economic impacts. While the needs of world anergy continue to increase. The increase reached 80% until 2040. To overcome this problem, scientists have developed gasification technology that can produce fuel as a substitute for fossil fuel. Gasification from biomass can produce synthetic gas that is more environmentally friendly and renewable. so the purpose of this study was to determine the effect of different forms of raw material and temperature on hydrogen produced by the gasification process made from sugarcane bagasse. This research was conducted through a process of gasification made from bagasse biomass to produce synthetic gas that can replace fossil fuel. The type of reactor used is downdraft type reactor. This research was carried out by the gasification process using raw material in the form of sugarcane bagasse with diameters and lengths of 6 mm and 50 mm respectively and the others in the form of fibers . Gasification is also carried out with variations in temperature, namely 800, 950 and 1,050oC . After that, the synthetic gas produced is tested by Gas Chromatography on each variable so that the hydrogen content is known. The hydrogen produced is defined in the form of H2, CH4 products, and the value of hydrogen conversion efficiency. The results obtained showed an increase in H2, CH4, and hydrogen conversion efficiency with an increase in gasification temperature, both in the form of pellets and ash. As for the change in the form of raw materials from pellets to fibers, it causes a decrease in H2, CH4, and hydrogen conversion efficiency values. H2 compositions produced at temperatures of 800, 950, and 1050oC were 10.618, 12.080, 11.312% by volume and 3.025, 2.925, 3.150% by volume, respectively. CH4 composition for raw materials in the form of pellets and fibers at temperatures of 800, 950, and 1050oC were 1.040, 2.622, 2.867% by volume and 0.846, 0.856, 1.051% by volume, respectively. The value obtained is relatively very small compared to the results obtained in previous studies. The value of hydrogen conversion efficiency for raw materials in the form of pellets and fibers at 800, 950, and 1050oC are 1.62%, 3.45%, 3.91% and 1.89%, 1.92%, 2, 32%.

Engineering of Sequential-Series Multijunction Dye-Sensitized Solar Cells for Greater Than 10% Solar-to-Electric Efficiency and 2.0 V Photovoltage Output

Sequential series multijunction dye-sensitized solar cells (SSM-DSCs) are mechanically stacked single illuminated area DSC devices wired in series to harness photovoltage. SSM-DSCs are strategically designed to optimally utilize the potential energy of photons in each region of the solar spectrum. For this study, strategies to minimize photon reflection losses from glass and glass-air interface and photon management are combined. With a judicious choice of the sensitizer, TiO2 film thickness, solution processable “CYTOP” antireflection coating and immersion oil SSM-DSCs with power conversion efficiency >10% and 2.3 V photovoltage were achieved. Importantly, the SSM-DSC efficiency was substantially higher than any single device in the stack. Furthermore, without external bias this SSM-DSC configuration shows an impressive overall solar-to-fuel conversion efficiency of 6% when powering IrO2 and Au2O3 electrocatalysts for CO2 and H2O to CO and H2 conversion in aqueous solution. Concept of photon management in SSM-DSCs, device engineering, and role of CYTOP will be covered in the talk.

Catalytic consequences of the identity of surface reactive intermediates during direct hydrogen peroxide formation on Pd particles

H2O2 formation directly from H2 and O2 on Pd particles in water has proven to proceed via two different kinetic regimes defined by the operating H2/O2 ratios using kinetics, isotopic experiments and variation of particle sizes under conditions of kinetic control. These kinetic regimes exhibit different rate equations, kinetic isotope effects and structure sensitivity, while a transition among regimes occurs as the surface reactive intermediates changing from nearly uncovered to saturated with chemisorbed hydrogen (H*) with the increasing of H2/O2 ratio. On nearly bare Pd surfaces, irreversible H2 dissociation limits the rates of H2O2 formation and H2 conversion, thus, rates increase proportionally with H2 pressure but independent of O2 pressure. On H* saturated Pd surfaces, H2 dissociation approaches to chemical equilibrium and the H* mediated HOOH* formation step becomes the sole kinetically relevant step, therefore, rates become insensitive to H2 pressure but are linearly proportional to O2 pressure. The first-order rate coefficients for H2O2 formation become a single-valued function of the operating H2/O2 ratio.

Fabrication of a NiCo2O4/Zn0.1Cd0.9S p-n heterojunction photocatalyst with improved separation of charge carriers for highly efficient visible light photocatalytic H2 evolution

Photocatalytic hydrogen (H2) evolution is a greatly promising strategy for solar to H2 conversion. However, photocatalytic activity of single photocatalyst is limited due to the fast recombination of photogenerated charge carriers. Recently, various heterojunction photocatalysts have been constructed to improve photocatalytic activity. Herein, a novel NiCo2O4/Zn0.1Cd0.9S (NCO/ZCS) p-n heterojunction photocatalyst was fabricated via a simple calcination method. The optimized NiCo2O4 content is 3 wt%, and corresponding NCO/ZCS shows the maximum H2 evolution rate of 34.4 mmol g−1 h−1 under visible light irradiation, which is over 4.9 times higher than that of pure ZCS, and has the apparent quantum efficiency of 58.8% at 420 nm. The improved photoactivity of NCO/ZCS can be attributed to the construction of NCO/ZCS p-n heterojunction. In addition, a possible mechanism for photocatalytic H2 evolution of NCO/ZCS p-n heterojunction was proposed.

Moderate-pressure conversion of H2 and CO2 to methanol via adsorption enhanced hydrogenation

CO2 hydrogenation to methanol plays an increasingly important role in fields of chemical engineering, energy generation and H2/CO2 utilization, and the prohibitive costs result partially from the high operating pressures required for practical application. Thus, a hybrid catalyst/adsorbent consisting of Cu-ZnO-ZrO2 supported on hydrotalcite (named CZZ@HT) was synthesized, characterized and analyzed in this study with the intent that the adsorbent hydrotalcite would enhance the local concentration of CO2 and assist in catalyst dispersion. The as-prepared CZZ@HT catalyst containing 43.4 wt% of CuO-ZnO-ZrO2 in the form of well dispersed nanoparticles possessed a considerable BET surface area and external surface area after reduction. A remarkable copper dispersion of 58.7% was thereby achieved. This reduced catalyst displayed elevated uptakes of H2O and CO2 at 473 K compared to the reference adsorbent-free catalyst and presented enhanced adsorption capacities of CO2 at reaction temperatures due to collective effects of physisorption and chemisorption. Catalysis experiments on a fixed bed reactor using the rCZZ@HT catalyst showed a methanol selectivity of 83.4% and a SMeOH/SCO ratio of 5.0 in products. A control experiment in which hydrotalcite was replaced with quartz (named rCZZ&QS) showed considerably lower conversion at low pressure and demonstrated the enhancing effect of the hydrotalcite support. The new catalyst could achieve the same methanol productivity as the control catalyst at 2.45 MPa lower reaction pressure. This lower pressure corresponds to a ∼61.3% savings in energy consumption for compression. Accordingly, the CZZ@HT is a promising candidate for CO2 hydrogenation to methanol at moderate pressures.

Electrospun carbon nanofiber-encapsulated NiS nanoparticles as an efficient catalyst for hydrogen production from hydrolysis of sodium borohydride

Carbon nanofibers (CNFs) incorporating NiS nanoparticles (NPs), namely NiS@CNFs were prepared by one-step electrospinning and successfully employed as a catalyst for hydrogen production from hydrolytic dehydrogenation of sodium borohydride (SBH). As-prepared NiS@CNFs, composed of polyacrylonitrile (PAN), nickel acetate, and ammonium sulfide, was calcined at 900 °C in argon atmosphere, and characterized using standard surface science techniques. The combined results revealed the growth of NiS NPs inside the CNFs, hence confirmed the presence of elemental Ni, S, and C. The as-prepared NiS@CNFs catalyst has a significantly higher surface area (650.92 m2/g) than the reported value of 376 m2/g. Importantly, this catalyst exhibited a much higher catalytic performance, for H2 production from SBH, than that of Ni@CNFs, as evidenced by its low activation energy (∼25.11576 kJ/mol) and their Rmax values of 2962 vs. 1770 mL/g·min. Recyclability tests on using NiS@CNFs catalyst showed quantitatively production (∼100% conversion) of H2 from SBH and retained up to 70% of its initial catalytic activity after five successive cycles. The low cost and high catalytic performance of the designed NiS@CNFs catalyst enable facile H2 production from readily available hydrogen storage materials.

Towards clean palm oil processing: Integrated ammonia production from empty fruit bunch and palm oil effluent

In this study, we design and evaluate a highly efficient energy system for performing an integrated conversion of empty fruit bunches (EFB) to H2 that is stored in the form of ammonia (NH3). The biomass undergoes processes that include supercritical water gasification (SCWG) for H2 production and H2 chemical storage using the Haber-Bosch process to produce NH3. Exergy recovery by heat integration is employed to increase the efficiency of the system. First, EFBs are gasified with steam in the SCWG process to produce H2-rich syngas and to completely remove the pre-drying requirement. Subsequently, a syngas chemical looping (SCL) process involving three reactors is used to produce H2 that is subsequently converted to NH3 by the Haber-Bosch process. Theoretically, the integrated process can achieve a high EFB-to-NH3 conversion efficiency that exceeds 15% with a H2 conversion efficiency of 76.2% and an overall maximum syngas-to-H2 conversion efficiency of 46.3% with 100% CO2 capture capability. Compared to traditional EFB conversion processes, this process can theoretically achieve higher efficiency, and it can improve waste utilization in palm oil processing plants by incorporating exergy recovery and heat integration into the system.

Preparation of Catalyst Cu-ZnO-MgO-Al2O3 for Direct Synthesis of DME

Direct synthesis of DME catalyst was prepared using the co-precipitation method. The catalyst contained CuO/ZnO/Al2O3 about 40/27/33 (%-wt). Two types of catalyst were prepared, i.e. CZMA0 (Mg 0%-wt) and CZMA20 (Mg 20%-wt). Both of catalysts were activated using reducing gas (5% H2 and N2). The activity test was conducted by syngas model which contained (%-mole) 65% H2, 28% CO and 7% N2. The reaction was carried out in a fixed bed reactor at 5 bar, and temperature of 240, 250 and 260°C. Synthesis shown CZMA20 catalyst gave the highest catalytic activity with 73% of CO conversion and 66% of H2 conversion (5 bar and 260°C). Direct synthesis of DME was also carried out using a dual-catalyst, i.e. catalyst for methanol synthesis (M151, the commercial catalyst of methanol synthesis) and methanol dehydration (γ-Al2O3-ITB). The activity of dual catalyst shown 93% of CO conversion and 91% of H2 conversion. This activity was more stable than two other catalysts (CZMA0 and CZMA20).

Coproduction of Hydrogen and Methanol from Methane by Chemical Looping Reforming

Coproduction of hydrogen and methanol from methane by chemical looping reforming is a novel approach to transform natural gas. Compared with conventional reforming processes, the mole ratio of methane to water fed to a chemical looping reactor can be the stoichiometric ratio without concerns over coking. In this work, the redox scheme was experimentally and numerically investigated, where a SrFeO3−δ perovskite acted as the oxygen transfer agent. To improve its redox performance, SrFeO3−δ was dispersed into three oxides: CaO, MnO, and CaO·MnO. Among them, CaO·MnO enhances the reforming performance best. Specifically, SrFeO3−δ/CaO·MnO composites exhibit 6.9% coke selectivity, 66.2% maximum instantaneous methane conversion, and 91.5% syngas (H2/CO ≈ 2) selectivity in the methane partial oxidation step and up to 90% H2O to H2 conversion in the water splitting step at a redox temperature of 900 °C. Further studies suggest that the low coke selectivity stems from the reaction between manganese oxide and coke or its precursor, which becomes more favorable at high temperatures. To evaluate the process of solar fuel production by chemical looping technology, an economic analysis of the coproduction of the hydrogen and methanol process was carried out and compared with conventional methanol synthesis. Compared with thermally driven methanol synthesis, the solar-driven coproduction scheme demonstrates 14% exergy efficiency improvement, 63% CO2 emission reduction, and 1.9 times more net income than the former. Our findings demonstrate that solar-driven chemical looping reforming is a very promising option for solar fuel production.

Introducing a novel process to enhance the syngas conversion to methanol over Cu/ZnO/Al2O3 catalyst

In this study, a novel configuration, Adiabatic and Plate Water-cooled Reactors, which called APW is introduced as an alternative for a two stage conventional methanol process consisting of gas-cooled and water-cooled reactors. In the APW configuration, the gas-cooled reactor is replaced with two adiabatic reactors with the optimized basic design. A water-cooled reactor is like a plate heat exchanger with three sections by the different number of plates. The gas flow rate through each section is optimized, so that pressure and temperature changes along these sections are almost identical. Mathematical modeling indicates that, temperature rise within the adiabatic reactor precludes gas condensate formation, consequently improves the catalyst durability. Moreover, the small length to cross section ratio of the adiabatic bed results in low pressure drop. Also, high average temperature and low pressure drop along the adiabatic beds enhance methanol production. The proposed configuration, provides different advantages than the conventional process, e.g. low pressure drop, high cooling efficiency of the water-cooled reactor and higher H2 and CO2 conversions. The APW configuration enhances the methanol production rate 12.2% in comparison with conventional configuration. Other advantages in this configuration are, eliminating condensate formation, preventing greenhouse gas emissions and improving catalyst durability.

Syngas‐Free Highly Regioselective Rhodium‐Catalyzed Transfer Hydroformylation of Alkynes to α,β‐Unsaturated Aldehydes

AbstractThe hydroformylation of alkynes is a fundamental and important reaction in both academic research and industry. Conventional methods focus on the conversion of alkynes, CO, and H2 into α,β‐unsaturated aldehydes, but they often suffer from problems associated with operation, regioselectivity, and chemoselectivity. Herein, we disclose an operationally simple, mild, and syngas‐free rhodium‐catalyzed reaction for the hydroformylation of alkynes via formyl and hydride transfer from an alkyl aldehyde. This synthetic method uses inexpensive and easy‐to‐handle n‐butyraldehyde to overcome the challenge posed by the use of syngas in traditional approaches and employs a commercially available catalyst and ligand to transform a broad range of internal alkynes, especially alkynyl‐containing complex molecules, into versatile stereodefined α,β‐unsaturated aldehydes with excellent chemo‐, regio‐, and stereoselectivity.