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Engineering Mn–Na2WO4catalysts for efficient oxidative coupling of methane (OCM) at low temperatures (T≤ 700 °C) is appealing yet challenging. Herein, we report a LaCeZr ternary oxide supported Mn–Na2WO4catalyst, which achieves 20.9% C2yield at 700 °C with at least 50 hour stability. Characterizations suggest that LaCeZr ternary oxides can promote the redox properties of Mn–Na2WO4catalysts, which facilitate O2activation at low reaction temperatures and generate more active oxygen species to activate CH4into C2products.

In the presence of I2, an acyloxyselenenylation of alkenes with diselenides and carboxylic acids is developed. This metal-free iodine-mediated acyloxyselenenylation proceeds efficiently under mild reaction conditions, affording a series of 2-acyloxy-1-selenides with high regioselectivity and in moderate to good yields.

Aimed at the problem that system energy consumption of the traditional cooperative multicast is large with increase of the number of users, four energy-efficient relay selection schemes are proposed to reduce system energy consumption. By using exhaustive search method, the optimal relay selection algorithm selects relays from all the possible combinations of relays, the scheme could reduce energy consumption and improve energy efficiency effectively at high computational complexity. According to the thought of iteration, greedy algorithm chooses relays using the selected relays, though the scheme doesn’t achieve the energy efficiency of the optimal relay selection algorithm, it reduces computational complexity. Besides, relay selection based on multicast rate of users selects relays using the multicast rate of each user by which the rest users with bad channel condition could decode data correctly, and relay selection based on channel state information (CSI) among users chooses relays according to the whole CSI between each user decoded data correctly and all users failed to decode data, these two schemes further reduce complexity compared to greedy algorithm. Results show that all the proposed energy-efficient relay selection approaches could improve energy efficiency while meeting the requirement of fairness.

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