Dimensional Understanding of Boron-Based Catalysts for Oxidative Propane Dehydrogenation: Structure and Mechanism

Abstract

The superiority of boron-based (B-based) catalysts in inhibiting olefin peroxidation has shed light on the industrialization landscape of the oxidative dehydrogenation of propane (ODHP) technology. However, owing to the complexity of the structure and reaction network of B-based catalysts, systematic understanding of the structure–performance relationship and the relevant mixed surface-gas radical mechanism remains limited. In this review, we summarize the latest research advances in the performance of different B-based catalysts and the ODHP reaction mechanism in different spatial dimensions. The construction of active sites from one-dimension (1-D) to three-dimension (3-D) of different catalysts and their ODHP catalytic performances were analyzed in detail, and the structure–activity relationship of the catalysts was elucidated. In addition, potential strategies for enhancing the space–time yield of the catalysts were discussed. Furthermore, this review also thoroughly analyzes the ODHP mechanism about the reaction pathways, key intermediates, rate-determining steps, and catalytic kinetics at the 1/2-D surface active sites and the 3-D gas phase. Finally, we summarize the synergism of surface and gas-phase radical reactions involved in the ODHP reactions and propose the reaction network. Based on existing challenges, the restrictions of this catalytic system were determined to suggest the direction for future studies.

Catalyst development for O2-assisted oxidative dehydrogenation of propane to propylene

“…Although some excellent reviews have summarized the catalytic systems for ODHP, they have focused on the relationship between ODHP performance and catalyst structures. 29–31 Other reviews have paid much attention to ODHP with CO 2 assistance 32 or the comparison of direct and CO 2 -assisted ODHP (CO 2 -ODHP). 26 Thus, the regulation of O 2 -ODHP selectivity under mild conditions has not received enough attention.…”

Mapping the Catalytic‐Space for the Reactivity of Metal‐free Boron Nitride with O2 for H2O‐Mediated Conversion of Methane to HCHO and CO

“…Recently, boron-based catalysts such as boron oxide (B 2 O 3 ) [6][7][8][9][10] and hexagonal boron nitride (h-BN) [11][12][13][14] emerged as promising candidates in catalyzing the PO of light alkanes. [15][16][17][18] Earlier studies on these catalysts were mainly focussed on the conversion of C 2 À C 4 alkanes to their respective alkenes.…”

Kinetic Insights into Boron-Based Materials Catalyzed Oxidative Dehydrogenation of Light Alkanes

“…Understanding the reaction kinetics is crucial for the design and synthesis of boron-based catalysts with high ODH activity and stability. Several excellent reviews were published recently covering the advances in the ODH catalyzed by boron-based catalysts, − focusing on identifying of active sites on boron-based catalysts, summarizing the performance of different types of boron-based catalysts, and discussing existing mechanistic hypotheses. Kinetic behaviors of boron-based catalysts in the ODH were touched upon in these reviews; however, a summary of kinetic analyses in current literature remains absent.…”