Regeneration of a Commercial Catalyst for the Dehydrogenation of Isobutane to Isobutene

Abstract

In the chemical and petrochemical industries, dehydrogenating of hydrocarbons to olefins as raw materials for the manufacture of various chemical products is an important economic issue. So, here, the redispersion and regeneration of a commercial Pt‐Sn/γ‐Al2O3 catalyst utilized for the conversion of isobutane to isobutene was studied. First, in order to regenerate the deactivated commercial catalyst unloaded from a commercial reactor, coke burning under controlled conditions was carried out. Then, to redisperse the platinum on the surface of the catalyst, a HCl solution (injected through a syringe pump) and Cl2 were passed over the catalytic bed at specific flow rates and temperatures. Evaluation tests carried out over the regenerated catalyst prove that the regenerated catalyst has similar conversion, selectivity, and structural characteristics as compared to the fresh one.

In situ formation of ZnOx species for efficient propane dehydrogenation

“…3,4 ) or Pt-containing (refs. [5][6][7][8] ) catalysts suffer from the toxicity of Cr(vi) compounds or the need to use ecologically harmful chlorine for catalyst regeneration 9 . Here, we introduce a method for preparation of environmentally compatible supported catalysts based on commercial ZnO.…”

Novel preparation of highly dispersed Ni2P embedded in carbon framework and its improved catalytic performance

“…Cr(VI) species formed during the catalyst preparation, application and waste catalyst treatment are harmful to human and environment [17]. As for Pt-Sn-based catalysts, the higher cost is a main obstacle [18]. Therefore, the key issue for dehydrogenation of isobutane is to find an inexpensive and environmentally friendly catalyst system with high activity and selectivity.…”

A Highly Stable Bimetallic Transition Metal Phosphide Catalyst for Selective Dehydrogenation of n‐Heptane

“…[9] Pronounced activity for hydrogenolysis and aromatization can form different types of coke, which requires expensive catalyst regeneration and reactivation. [10] Furthermore, selectivity to linear olefins usually decreases with increasing chain length of the linear alkanes in catalytic dehydrogenation. Thereby, side reactions like hydrogenolysis, isomerization, dehydrocyclization, aromatization and coke formation become more pronounced.…”

“…As a further mechanism of deactivation, catalyst coking plays an important role in alkane dehydrogenation [9] . Pronounced activity for hydrogenolysis and aromatization can form different types of coke, which requires expensive catalyst regeneration and reactivation [10] . Furthermore, selectivity to linear olefins usually decreases with increasing chain length of the linear alkanes in catalytic dehydrogenation.…”