Catalytic direct oxidation of methane to methanol by redox of copper mordenite

Abstract

Expectations for industrial implementation of direct conversion of CH4 to CH3OH are growing with the increasing demand for energy-efficient chemical processes. In this study, catalytic production of CH3OH by direct...

Molecular insight into the role of zeolite lattice constraints on methane activation over the Cu–O–Cu active site

“…[18][19][20][21][22] Zeolites are microporous materials primarily composed of SiO 4 and AlO 4 tetrahedra (T), which share their O atoms with the neighboring T sites and are arranged in a variety of ways to form a three-dimensional framework structure with over 230 topologies. 23 Among these, the MOR, 24,25 MAZ, 24,26 and ERI 27 frameworks have been reported to provide a unique environment for the Cu active site to yield high amounts of CH 3 OH. For instance, Cu-MAZ with its long stick-like bundled morphology has been reported to provide a high diffusion rate for the formed CH 3 OH and thus yield 197 mmol g À1 -zeolite of CH 3 OH, the highest value reported thus far.…”

High-throughput screening and literature data-driven machine learning-assisted investigation of multi-component La2O3-based catalysts for the oxidative coupling of methane

“…Actually, combined reports describe that Pd prefers CH 4 combustion, 52 whereas Ni is known for CH 4 reforming and carbon deposition. 53 Indeed, in our earlier classifications, 22,26,48 these two elements were placed in the "worse" element set for OCM.…”

“…The nominal loading amount for each metal was fixed at 0.3 wt% in theory according to our earlier report. 48 Thereafter, the resulting slurry was centrifuged and evaporated at 80 °C (CVE-3110; EYELA -Tokyo Rika Kikai Ltd.) and dried at 110 °C for 2 h (ON-300S, ETTAS; As One Corp.). After grinding the obtained powder, it was calcined at 600 °C for 3 h at a ramping rate of 10 °C min −1 in a furnace (3000 plus; KDF -Denken Highdental Co. Ltd.).…”

“…† However, this point is unimportant in the present study because the metal loading, calcination temperature, and reactor design differ from that of the HTS machine. 22,26 Because the HTS data-derived indirect ML nicely assisted the prediction of lower-temperature La 2 O 3 -based OCM catalysts (11 appearances/20 validations), itemset mining with LCM 48,50 was further implemented to ascertain the common physical rules within highly active catalysts in the SVR space of the HTS datasets toward new ideas. Using this approach, 300 random catalyst-based HTS datasets ‡ 26 were used, excluding 59 catalyst-based HTS datasets.…”

Extraction of Catalyst Design Heuristics from Random Catalyst Dataset and their Utilization in Catalyst Development for Oxidative Coupling of Methane

“…Thus, activation of methane at milder conditions and suppression of the secondary oxidation at severer conditions are important directions for catalyst development. [16,17] Recently, we have developed a high-throughput screening (HTS) instrument, which enables fully automated performance evaluation for 20 catalysts placed in parallelized fixed-bed reactors at a predefined series of reaction conditions. [18] It allows an access to large, uniform, and process-consistent catalyst data in a realistic timeframe.…”