Toast pecans in 12" non-stick skillet over medium-high heat, stirring occasionally, about 3 minutes or until fragrant. Stir in maple syrup, 1 tbsp butter, and 1/8 tsp salt. Stir constantly until nuts are dry and glossy, then transfer to plate and set aside.
Wipe out skillet. Melt remaining 2 tbsp butter in skillet over medium heat. Add shallots, orange zest, and pinch of cayenne pepper. Cook, stirring occasionally, 2 minutes or until shallots are softened. Stir in flour until combined, then add green beans. Add chicken broth, orange juice, and sage. Increase heat to medium-high, cover, and cook until beans are crisp-tender (about 4 minutes).
Uncover and cook about 4 minutes, until beans are tender and sauce has slightly thickened. Remove from heat. Season with salt and pepper to taste. Transfer to serving dish, sprinkle with pecans, and serve.