Readily processed multifunctional SiC catalytic filter for industrial emissions control

Abstract

One step fabrication of SiC catalytic filter is currently limited by the mismatched calcination temperature between SiC filter (>1700 C) and the catalysts (<800 C), and the difficulty in the chemical immobilization of catalysts. Here, a SrTi 1Àx Co x O 3 -SiC (STC-SiC) catalytic filter was directly fabricated from raw SiC grains and STC precursor oxides (SrCO 3 , TiO 2 , and Co 3 O 4 ) via a single-step reactive thermal processing (SRTP) approach, which significantly reduced energy consumption and sintering time over 50%. Acid etching enables the active TiO 2 and Co 3 O 4 nanoparticles spontaneously formed on STC catalysts in STC-SiC catalytic filter (STC-SiC-A), which induces the generation of oxygen vacancies and facilitates the adsorption and activation of O 2 and NO. The STC-SiC-A catalytic filter exhibits highly competitive NO oxidation of 60% and complete dust interception (100%) at 360 C. This work demonstrates an efficient and rapid processing technique of SiC based catalytic filters, which can also be implemented on other ceramic-based catalytic filters.

Preparation of asymmetric tubular Co‐SiC catalytic membrane for synergistic removal of PM2.5, NO, and toluene

“…In our previous work, we found that the acid‐treating process can construct Co 3 O 4 nanoparticles on STC in the STC‐SiC catalytic membrane through a surficial reconstruction process 35 . Herein, the acid‐treating process was also conducted to generate Co 3 O 4 nanoparticles in the TCS catalytic membrane.…”

“…Recently, we reported the successful fabrication of multifunctional disc-shaped SrTi x Co 1Àx O 3 -SiC (STC-SiC) catalytic membrane through a single-step reactive thermal processing (SRTP) approach. 35 The STC-SiC catalytic membrane exhibits prominent PM 2.5 filtration and NO oxidation efficiencies compared to other reported counterparts at high temperatures. Here, we report the fabrication of a high-performance tubular Co-SiC (TCS) catalytic membranes, with an effective area of about 226 cm 2 , for simultaneous removal of PM 2.5 , NO, and toluene through combined cold isostatic pressure molding, spin spray-coating of the separation layer and acid-treating processes.…”

“…metal Co) generated through acidtreating process, as evidenced by our previous work. 35 The reduction peaks at high temperatures (307 and 566 C) of TCS catalytic membrane can be ascribed to the sequential reduction of Co 3+ to metal Co in Co 2 SiO 4 , indicating that a strong interaction between Co and Si in Co 2 SiO 4 . The strong reduction peak intensity implies an abundant reducible species existed in the TCS catalytic membrane, which is conductive to the catalytic oxidation performance.…”

“…In our previous work, we found that the acid-treating process can construct Co 3 O 4 nanoparticles on STC in the STC-SiC catalytic membrane through a surficial reconstruction process. 35 Herein, the acid- The redox property and reactive oxygen species of the TCS catalytic membrane were further characterized using temperature programmed desorption. H 2 -TPR characterization result showed that four redox peaks were observed in the TCS catalytic membrane within the whole test (Figure 5C).…”

“…Recently, we reported the successful fabrication of multifunctional disc‐shaped SrTi x Co 1− x O 3 ‐SiC (STC‐SiC) catalytic membrane through a single‐step reactive thermal processing (SRTP) approach 35 . The STC‐SiC catalytic membrane exhibits prominent PM 2.5 filtration and NO oxidation efficiencies compared to other reported counterparts at high temperatures.…”