Abstract
In this research, a mono-sized Beta zeolite support synthesized by the solvothermal method was used in the selective acetylene to ethylene hydrogenation reaction with minimum coke build up on the catalyst surface. Tetrapropylammonium hydroxide (TPAOH), tetrapropylammonium bromide (TPABr), n-butylamine, and morpholine were used as structure direct agents (SDA) in the support to obtain various shapes. The characterization results show that although the Si/(Al+SDA) ratio has no effect on the phase purity of support, it has a remarkable effect on porosity, crystal size, shape, and structure of micropores. After comparing characterization results, the developed support, based on TPAOH, was selected and modified by different metals (Ce, Ir, Ag, and Pd) using the incipient wetness co-impregnation method. Since there is an interaction between selectivity and conversion, the optimum metal content in the synthesized catalysts and reaction condition were determined to achieve the desired acetylene conversion and ethylene selectivity. The physicochemical transformation of the developed optimum catalysts was determined using different techniques. Based on the characterization and cata-test results, the catalyst which contains 0.29% Ir and 0.08% Pd presents a better performance and higher stability compared to the other catalysts due to the moderate size and mono layer dispersion of the metals on the support. The experimental results show that acetylene conversion and ethylene selectivity approach 97% and 92% at 55 °C, respectively.
Highlights
In the previous few decades, synthetic micro/meso-porous materials have played a significant role in addressing social subjects such as the extra effective utilization of reproducible resources or fossils, to meet more accurate environmental standards [1,2,3]
This demonstrates that augmenting Tetrapropylammonium hydroxide (TPAOH) results in a moderate pore size distribution in the supports, and the micro porosity of samples could be adjusted by adding various amounts of structure direct agents (SDA)
We successfully synthesized a unique type of Beta zeolite as support with an incipient wetness co-impregnation-solvothermal method
Summary
In the previous few decades, synthetic micro/meso-porous materials have played a significant role in addressing social subjects such as the extra effective utilization of reproducible resources or fossils, to meet more accurate environmental standards [1,2,3]. That are classified as nanostructured catalysts, have a considerable surface-to-volume ratio which favorably affects their catalytic activity [4,5]. That are synthesized by various methods such as solvothermal treatment, hydrothermal treatment, etc. Zeolite Beta is a famous substance which has 12-loop crossovers channels with a pore size distribution of around
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