Light-Alkane Oxidative Dehydrogenation to Light Olefins over Platinum-Based SAPO-34 Zeolite-Supported Catalyst

Abstract

The experiments were conducted to study Pt–Sn/SAPO-34 catalyst utilization for oxidative dehydrogenation (ODH) of light paraffins to olefins. In recent times, the interesting concept of similar catalytic bed usage for direct dehydrogenation (PDH) and ODH has gotten attention. The light-paraffin ODH process was enhanced over the Pt–Sn-based catalyst using SAPO-34 as a support. The catalyst demonstrated promising results for propane and butane dehydrogenation, where the initial feed conversion is about 70 wt % at optimum operating conditions of 2:1 feed/oxygen ratio and 550 °C because of lower carbon monoxide and carbon dioxide (CO x ) formation. A negligible amount of coke formation and a slower deactivation rate was noticed over the proposed catalyst in comparison with the PDH reaction and other ODH processes. Propylene and butene selectivities were obtained above 96 and 90 wt %, respectively. This superior light-olefin selectivity in the ODH reaction was due to superior catalytic control of reaction by providing suitable hydrogen-abstraction platinum sites and intermediate product conversion over SAPO-34. The catalyst performance was analyzed by comparing experimental justification with characterization like X-ray fluorescence, surface area, dioxygen-pulse coke analysis, dihydrogen chemisorption, and transmission electron microscopy.

The Ti3AlC2 MAX Phase as an Efficient Catalyst for Oxidative Dehydrogenation of n‐Butane

“…Butenes, and especially butadiene, are important industrial precursors for producing synthetic rubbers and plastics. This reaction has recently gained importance with the advent of shale gas and the increased use of natural gas as a cleaner carbon source . The problem is that the typical conditions that can activate alkanes often lead to low alkene selectivity, because the products are oxidized further to CO and CO 2 .…”

The Ti3AlC2 MAX Phase as an Efficient Catalyst for Oxidative Dehydrogenation of n‐Butane

“…Butenes, and especially butadiene, are important industrial precursors for producing synthetic rubbers and plastics. This reaction has recently gained importance with the advent of shale gas and the increased use of natural gas as a cleaner carbon source . The problem is that the typical conditions that can activate alkanes often lead to low alkene selectivity, because the products are oxidized further to CO and CO 2 .…”

Highly Active and Stable Pt–Sn/SBA-15 Catalyst Prepared by Direct Reduction for Ethylbenzene Dehydrogenation: Effects of Sn Addition

“…50% and high styrene selectivity at low reaction temperatures (673 K) in the absence of steam . In fact, many researchers have investigated the catalytic dehydrogenation reactions over Pt or modified Pt catalysts. − Supported Pt–Sn alloy catalysts are reported as highly efficient catalysts for dehydrogenation of ethane, − propane, − isobutane, , and n -butane. − Pt–Sn bimetallic catalysts often show superior catalytic activity and selectivity compared with the supported monometallic Pt catalysts. However, the mechanism explaining the modified catalytic behavior of platinum with tin as the promoter remains a matter of debate.…”