Abstract
Recently, many scientists have focused on the development of green industrial technology. However, the process of synthesizing vinyl chloride faces the problem of Hg pollution. Via a novel approach, we used two elements Mo and Ti to prepare an inexpensive and green binary transition metal nitride (BTMN) as the active ingredient in a catalyst with nano-sized particles and an excellent degree of activation, which was supported on activated carbon. When the Mo/Ti mole ratio was 3:1, the conversion of acetylene reached 89% and the selectivity exceeded 98.5%. The doping of Ti in Mo-based catalysts reduced the capacity of adsorption for acetylene and also increased the adsorption of hydrogen chloride. Most importantly, the performance of the BTMN excelled those of the individual transition metal nitrides, due to the synergistic activity between Mo and Ti. This will expand the new epoch of the employment of transition metal nitrides as catalysts in the hydrochlorination of acetylene reaction.
Highlights
Polyvinylchloride (PVC) has excited much attention owing to its high application value, low price, and comparatively simple preparation process
Its manufacturing process still faces an environmental issue, namely, in the synthesis of vinyl chloride monomer (VCM), which is the monomer of PVC, Hg used as the catalyst accumulates, which simultaneously brings about hazards to the environment
binary transition metal nitride (BTMN) had clearly different adsorption capability from transition metal nitrides (TMNs); the results show clearly that BTMNs were not formed by simple addition of the single TMNs, but constituted new chemical products such as Mo-Ti-N or other form, in agreement with the temperature-programmed desorption–mass spectrometry (TPD-MS) analysis [36]
Summary
Polyvinylchloride (PVC) has excited much attention owing to its high application value, low price, and comparatively simple preparation process. The four-layered stacking structure Co0.6 Mo1.4 N2 was employed under acidic conditions for the hydrogen evolution reaction; this layered structure allows the 3d transition metal to tune the electronic states of Mo at the surface of the catalyst without disrupting its catalytic activity [27]. In addition to these reactions, the hydrogenation of CO [28], production of hydrogen by decomposition of ammonia [29], and epoxidation of alkenes [30], etc., all proceeded with excellent activity. We were motivated to investigate the catalytic activity for the acetylene hydrochlorination of molybdenum and titanium BTMNs loaded on the classic support AC, of which the activity has not previously been reported
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