Hydrochlorination of acetylene to vinyl chloride over Pd supported on zeolite Y

Wang, Lu; Wang, Feng; Wang, Jide; Tang, Xianhui; Zhao, Yonglu; Yang, Dong; Jia, Fengmei; Tang, Hao

doi:10.1007/s11144-013-0580-3

Cited by 41 publications

(26 citation statements)

References 19 publications

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“…Even after 72 h, the Pd NPs were still uniformly dispersed in the IL phase with only a slight increase in particle size (Figure B) More importantly, the catalytic results showed no deterioration in both the conversion and selectivity over 72 h (Figure A). In contrast, in common supports such as activated carbon and zeolites, the Pd catalysts often encountered a rapid deactivation and even lost activity . The cheering phenomenon was not only attributed to the excellent dispersity of LCC‐ILs but also stemmed from the enhanced the redox cycle between Pd 0 and Pd 2+ within the IL nanoclusters, as discussed above.…”

Section: Resultsmentioning

confidence: 99%

“…However, toxic mercuric chloride causes serious environmental problems and is harmful to human health, making the exploration of environmentally friendly catalysts extremely urgent. Considerable catalytic activity has been achieved using transition metals such as, Au, Ru, and Pt . Hutchings et al have correlated the catalytic activity of metals with their electric potential; noting that the gold would be the most anticipated candidate catalyst instead of HgCl 2 .…”

Section: Introductionmentioning

confidence: 99%

“…However, aside from the high‐cost of noble metals, these metal catalysts are often rapidly deactivated, which limit industrial applications. Pd is a relatively cheap noble metal, but its active component is easily lost due to a relatively high volatility and weak interactions with supports or solvents . Until now, a wide variety of strategies have been developed to improve the stability of metal catalysts for C 2 H 2 hydrochlorination, including nitrogen or phosphorus‐doped carbon materials or other nanomaterials, fabricating bimetallic catalysts, and so on.…”

Section: Introductionmentioning

confidence: 99%

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Metal nanoparticles in ionic liquid‐cosolvent biphasic systems as active catalysts for acetylene hydrochlorination

Yang

et al. 2018

AIChE Journal

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Ionic liquid (IL)‐stabilized metal nanoparticles (NPs) have attracted increased attention as novel catalysts for various reactions due to their excellent stability and high activity. However, the high viscosity of ILs limits their applications. Here, for the first time, we reported an NPs@IL‐cosolvent liquid–liquid biphasic system for metal NPs catalysis. The NPs were successfully confined to IL phase, and abundant IL droplets containing NPs were generated under the reactant flow. The NPs@IL droplets served as microreactors for the catalysis; while the low viscosity organic phase enabled the rapid mass transfer of substances. The biphasic system exhibited improved performance for acetylene hydrochlorination than that of the pure IL system. An acetylene conversion of 98% and a selectivity of 99.5% were achieved along with a 90% decrease on IL usage. The tolerable gas hourly space velocity in the biphasic system for a satisfactory conversion was almost double that of the pure IL system. © 2018 American Institute of Chemical Engineers AIChE J, 64: 2536–2544, 2018

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Metal nanoparticles in ionic liquid‐cosolvent biphasic systems as active catalysts for acetylene hydrochlorination

Yang

et al. 2018

AIChE Journal

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“…h −1 and the lifetime of the PdCl 2 catalyst is usually only several hours. 19 Song et al prepared PdCl 2 /C catalysts via an incipient wetness impregnation method and studied the catalytic activity for acetylene hydrochlorination, they concluded that the deactivation of PdCl 2 /C can be attributed to the loss of the active component, surface carbon deposition, and the decrease of S BET 28 Wang et al 29 prepared a palladium catalyst (0.5 wt% of Pd) supported Y zeolite (HY) (Pd/HY) was prepared by ultrasonic-assisted impregnation. The potential of the catalyst for acetylene hydrochlorination was explored in a fixed-bed reactor at 160 C, V (HCl)/V (C 2 H 2 = 1 25 and gas hourly space velocity of C 2 H 2 = 110 h −1 .…”

Section: Pd Catalystsmentioning

confidence: 99%

Research Progress on Mercury-Free Catalysts for Acetylene Hydrochlorination

Meng¹,

Ding²,

Wang³

et al. 2014

energy environ focus

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Vinyl chloride monomer (VCM) is mainly used for synthesis of polyvinyl chloride (PVC). Two methods are employed for industrial synthesis of vinyl chloride monomer, the hydrochlorination of acetylene and the dehydrochlorination of ethylene dichloride (1,2-dichloroethane). In China, about 70% of VCM products are produced from acetylene hydrochlorination. It is a great challenge to use new-type mercury-free catalysts instead of highly toxic activated carbon supported HgCl 2 catalyst. In this contribution, the progress in research on mercuryfree catalysts for acetylene hydrochlorination is summarized, and the development prospects of mercury-free catalysts are looked forward.

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“…The Pd-Ag bimetallic catalysts have been found to be most efficient and are successfully employed on an industrial scale [59]. Also, a Pd-based catalyst supported Y zeolite was studied by Wang et al [60] and it was found that acetylene conversion and selectivity were about 95% and more than 90%, respectively. Although the catalyst displayed favorable catalytic activity for acetylene conversion and selectivity, it became easily deactivated as the reaction time exceeded 140 min [47].…”

Section: Introductionmentioning

confidence: 99%

Fine-Tuning Synthesis and Characterization of Mono-Sized H-Beta Zeolite-Supported Palladium-Iridium Nanoparticles and Application in the Selective Hydrogenation of Acetylene

2017

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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.

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Hydrochlorination of acetylene to vinyl chloride over Pd supported on zeolite Y

Cited by 41 publications

References 19 publications

Metal nanoparticles in ionic liquid‐cosolvent biphasic systems as active catalysts for acetylene hydrochlorination

Metal nanoparticles in ionic liquid‐cosolvent biphasic systems as active catalysts for acetylene hydrochlorination

Research Progress on Mercury-Free Catalysts for Acetylene Hydrochlorination

Fine-Tuning Synthesis and Characterization of Mono-Sized H-Beta Zeolite-Supported Palladium-Iridium Nanoparticles and Application in the Selective Hydrogenation of Acetylene

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