…By 2006, Wang had his breakthrough in sight. He’d found a way to unlock a chemical stored in the coal that was poisoning his country and to put it to an unlikely use: cleaning China’s air.

The catalyst he discovered speeds reactions that convert methanol extracted from coal into a substance called dimethyl carbonate. By adding dimethyl carbonate to diesel fuel, Wang now plans to cut 90 percent of black carbon soot from the tailpipe emissions of 1,800 Shanghai buses by year-end.

“We said, ‘Let’s go to China, where we can leverage brainpower that’s cheaper and do something important for mankind,” says Wang, 55, a wiry, self-described workaholic who, on this January day, is taking a break from his laboratory to greet visitors in a conference room at Yashentech Corp., the couple’s Shanghai-based company.

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