One‐Pot Preparation of Ni₂P/γ‐Al₂O₃ Catalyst for Dehydrogenation of Propane to Propylene

Abstract

The γ‐Al2O3 supported Ni2P catalysts for propane dehydrogenation were prepared by one‐pot method and evaluated to study the platinum‐like behaviour of Ni2P. The catalysts were characterized by X‐ray diffraction (XRD), Scanning Electron Microscope (SEM), Energy‐dispersive X‐ray Spectrometer (EDS), N2 adsorption at −196 oC and temperature‐programmed desorption of ammonia (NH3‐TPD). Results show that Ni2P is beneficial to the catalytic stability. It exhibits higher conversion for PDH of 23.8% and propylene selectivity of 74.4%.

Experimental and Computational Investigation of the Role of P in Moderating Ethane Dehydrogenation Performance over Ni-Based Catalysts

“…The authors speculate that the charge transfer from Ni to P weakens Ni−C bonding and improves selectivity. Yao et al 42 similarly reported that a Ni 2 P/γ-Al 2 O 3 catalyst is both more selective to propylene and produces less coke than a Pt/γ-Al 2 O 3 catalyst when used for propane dehydrogenation at 893 K. Zhu et al 43 found that a maximum in selectivity to isobutene occurred at a Ni/P ratio of 1, and they associated the high selectivity with the formation of a Ni 2 P phase, as identified by X-ray diffraction (XRD). The authors found that when insufficient P was added during synthesis, phases other than Ni 2 P formed, while addition of P above this ratio increased the acidity, resulting in reduced selectivity.…”

Ethane dehydrogenation performance and high temperature stability of silica supported cobalt phosphide nanoparticles

“…These results demonstrate that P incorporation significantly enhances the EDH performance of Co, which is consistent with the trends observed for light alkane dehydrogenation with other P promoted metals such as Ni, Ru, and Pt. [16][17][18][19][20]36 Co 2 P-E/SBA-15 was compared to reported catalytic results of EDH in literature and displayed comparable TOF values to Pt based alloys and other materials tested for EDH (Table S2 †). The H 2 to C 2 H 6 ratio for Co 2 P-E/ SBA-15 was also varied from 0 : 1 to 1 : 1 (Fig.…”

“…Catalyst stability was analysed by fitting the conversion as a function of time to eqn (4) which is based on a linear deactivation model. 18,19 X E is the ethane conversion at time t, X EO is the initial conversion, and k d is the deactivation constant.…”

“…14,15 For light alkane dehydrogenation reactions, P promotion of Ni results in improved selectivity to the desired alkene as well as improved stability over monometallic Ni nanoparticles. [16][17][18][19] These enhancements in dehydrogenation performance were attributed to geometric and electronic effects of P incorporation. Specifically, geometric isolation of the metal active sites through the presence of P in the crystal structure helps to limit structure sensitive side reactions, such as hydrogenolysis.…”

Effect of Vanadium Oxides Composition Loaded on γAl2O3 Catalyst for Oxidative Dehydrogenation of Propane to Propylene

“…Therefore, it is of great significance to develop an effective and economical method for propylene production. Propane can directly dehydrogenated to produce propylene, however, high reaction temperature was required to achieve C−H bond cleavage due to its stablity. But under the high‐temperature condition, thermal cracking tends to occur while producing lower alkanes and carbon deposits, which can lead to rapid deactivation of catalyst .…”